Re: Out of Band Connectivity Via Modems

Nice to hear we still have modems around :-)
It was so cool back then to distinguish by ear handshakes for different
speeds :-)
A.

On 9/1/2014 4:07 AM, mdb1986 wrote:
> Thank-you. As always seems to happen, the solution presents itself shortly
> after I email this list. It appears to be more a function of the last mile
> cabling to the affected modems. The horribly intermittent nature of the
> problem and variance in the level of diagnostics available with AT command
> set on the different modem chipsets make it hard too.
>
> Appreciate your insights.
>
>
> On Fri, Aug 29, 2014 at 2:12 PM, Andrey Tarasov <andyvt_at_gmail.com> wrote:
>
>> Have you tried setting calling modem to 2400 baud and see if that helps?
>> If call is routed via VoIP infrastructure at any point you are most likely
>> out of luck getting anything higher. Usual disclaimers about different
>> codecs, ymmv, etc.
>>
>> Regards,
>> Andrey.
>>
>>
>> On 8/29/2014 12:55 PM, mdb1986 wrote:
>>
>>> Hello Experts:
>>>
>>> Does anyone here have a good way to debug a modem handshake? We are
>>> seeing
>>> a chronic problem of one modem dialing another modem, we see call "RING"
>>> on
>>> the remote modem, but it never connects. Calls seem to be processed out
>>> our infrastructure fine. Carrier says they are routing as expected. I
>>> suspect there are some parameters that are not being agreed upon between
>>> the two devices, but the level of troubleshooting I'm able to do seems
>>> extremely limited.
>>>
>>> A few AT commands which will show you the stats, signal quality, etc., of
>>> a
>>> call that connects, but nothing that shows what's occurring as the modems
>>> are attempting to agree with one another, prior to call connecting.
>>>
>>> Thanks in advance.
>>>
>>>
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>>>
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Received on Mon Sep 01 2014 - 20:33:04 ART